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Introduction

Welcome to the SIB Days 2020 - virtual conference Spatial Transcriptomics workshop by 10x genomics!

The purpose of this tutorial will be to walk users through some of the steps necessary to explore data produced by the 10x Genomics Visium Spatial Gene Expression Solution and the Spaceranger pipeline. We will investigate the data sets are all freely available from 10x Genomics.

Seurat Tutorial

Things to know about this workshop

  1. All files that will be used can be found at: /mnt/libs/shared_data/

[Terminal]

  1. Getting started with R and Visium data outside of Seurat at: https://support.10xgenomics.com/spatial-gene-expression/software/pipelines/latest/rkit
  2. Reference genome for all samples is GRCh38/mm10
  3. All 10x software including Spaceranger, and Loupe Browser, can be downloaded from the 10x Support Site
  4. Most Seurat figures can be controlled with patchwork because they are fundamentally ggplot objects. Some really nice examples can be found on the Patchwork GitHub

Exploring Visium Data with Seurat

Load our packages

library(Seurat)
library(ggplot2)
library(patchwork)
library(dplyr)
library(RColorBrewer)

Loading data in a Seurat object

Real Dataset for the tutorial

breast_cancer <- Load10X_Spatial(data.dir = "/mnt/libs/shared_data/human_breast_cancer_1/outs/",
                filename = "V1_Breast_Cancer_Block_A_Section_1_filtered_feature_bc_matrix.h5")

Same data just internal to 10x

breast_cancer <- Load10X_Spatial(data.dir = "/mnt/analysis/marsoc/pipestances/HWHTFDSXX/SPATIAL_RNA_COUNTER_PD/163086/HEAD/outs/", slice = "slice1")

There are a bunch of data sets hosted by the Satija lab in the Seurat Data Package.

Results

QC

Let’s have a look at some basic QC information. Keep in mind that most Seurat plots are ggplot object and can be manipulated as such.

Counts = UMI Features = Genes

plot1 <- VlnPlot(breast_cancer, features = "nCount_Spatial", pt.size = 0.1) + 
  ggtitle("UMI") +
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot2 <- VlnPlot(breast_cancer, features = "nFeature_Spatial", pt.size = 0.1) + 
  ggtitle("Genes") +
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot3 <- SpatialFeaturePlot(breast_cancer, features = "nCount_Spatial") + 
  theme(legend.position = "right")

plot4 <- SpatialFeaturePlot(breast_cancer, features = "nFeature_Spatial") +
  theme(legend.position = "right")

plot1 + plot2 + plot3  + plot4 + plot_layout(nrow = 2, ncol = 2)

Normalization

Spaceranger does normalization for clustering and DE but does not return that normalized matrix

Pre-normalization Raw UMI counts

SpatialFeaturePlot(breast_cancer, features = c("ERBB2", "CD8A"))

SE transform

  • This will take ~3-4 min.

Don’t worry about reachediteration limit warnings. See https://github.com/ChristophH/sctransform/issues/25 for discussion

Default assay will now be set to SCT

breast_cancer <- SCTransform(breast_cancer, assay = "Spatial", verbose = TRUE)
Calculating cell attributes for input UMI matrix
Variance stabilizing transformation of count matrix of size 19751 by 3822
Model formula is y ~ log_umi
Get Negative Binomial regression parameters per gene
Using 2000 genes, 3822 cells

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Found 2 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 19751 genes

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Computing corrected count matrix for 19751 genes

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Calculating gene attributes
Wall clock passed: Time difference of 2.091646 mins
Determine variable features
Set 3000 variable features
Place corrected count matrix in counts slot
Centering data matrix

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Set default assay to SCT
SpatialFeaturePlot(breast_cancer, features = c("ERBB2", "CD8A"))

From Seurat:

The default parameters in Seurat emphasize the visualization of molecular data. However, you can also adjust the size of the spots (and their transparency) to improve the visualization of the histology image, by changing the following parameters:

pt.size.factor- This will scale the size of the spots. Default is 1.6
alpha - minimum and maximum transparency. Default is c(1, 1).
Try setting to alpha c(0.1, 1), to downweight the transparency of points with lower expression
p1 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5", pt.size.factor = 1)+ 
  theme(legend.position = "right") +
  ggtitle("Actual Spot Size")
p2 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5")+ 
  theme(legend.position = "right") +
  ggtitle("Scaled Spot Size")
p1 + p2

Dimensionality reduction, clustering, and visualization

We can then proceed to run dimensionality reduction and clustering on the RNA expression data, using the same workflow as we use for scRNA-seq analysis.

Some of these processes can be parallized

library(future)
# check the current active plan
plan()
# change the current plan to access parallelization
plan("multiprocess", workers = 4)
plan()

The default UMAP calculation is performed with the R-based UWOT library However, you can run UMAP in python via reticulate library and umap-learn. We have found that for smaller data sets (<= 10k cells/spots) UWOT is great. For much larger data sets (100k + cells/spots) umap-learn can be a faster option.

breast_cancer <- RunPCA(breast_cancer, assay = "SCT", verbose = FALSE)
breast_cancer <- FindNeighbors(breast_cancer, reduction = "pca", dims = 1:30)
Computing nearest neighbor graph
Computing SNN
breast_cancer <- FindClusters(breast_cancer, verbose = FALSE)
breast_cancer <- RunUMAP(breast_cancer, reduction = "pca", dims = 1:30)
The default method for RunUMAP has changed from calling Python UMAP via reticulate to the R-native UWOT using the cosine metric
To use Python UMAP via reticulate, set umap.method to 'umap-learn' and metric to 'correlation'
This message will be shown once per session11:22:48 UMAP embedding parameters a = 0.9922 b = 1.112
11:22:48 Read 3822 rows and found 30 numeric columns
11:22:48 Using Annoy for neighbor search, n_neighbors = 30
11:22:48 Building Annoy index with metric = cosine, n_trees = 50
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
11:22:48 Writing NN index file to temp file /tmp/RtmpHLaSG1/file707f428273fa9
11:22:48 Searching Annoy index using 1 thread, search_k = 3000
11:22:49 Annoy recall = 100%
11:22:50 Commencing smooth kNN distance calibration using 1 thread
11:22:50 Initializing from normalized Laplacian + noise
11:22:54 Commencing optimization for 500 epochs, with 157848 positive edges
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
11:23:03 Optimization finished

Now let’s have a look at the clustering

DimPlot(breast_cancer, reduction = "umap", label = FALSE,) +
  labs(color = "Cluster")

p1 <- DimPlot(breast_cancer, reduction = "umap", label = TRUE) +
  labs(color = "Cluster")
p2 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")

p1 + p2 + plot_annotation(
  title = 'Clustering in UMAP and Tissue Space',
  caption = 'Processed by Spaceranger 1.1\nNormilization and Clustering by Seurat'
) + plot_layout(nrow = 1)

I don’t really like these colors so let’s change them

myPalette <- colorRampPalette(rev(brewer.pal(11, "Spectral")))
p1 <- DimPlot(breast_cancer, reduction = "umap", label = TRUE) +
  labs(color = "Cluster") + 
  scale_color_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))

p2 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")+ 
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))

p1 + p2 + plot_annotation(
  title = 'Clustering in UMAP and Tissue Space',
  caption = 'Processed by Spaceranger 1.1\nNormilization and Clustering by Seurat'
) + plot_layout(nrow = 1)

If interested you can also now look at UMI and Gene counts per cluster as well

plot1 <- VlnPlot(breast_cancer, features = "nCount_Spatial", pt.size = 0.1) + 
  ggtitle("UMI") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot2 <- VlnPlot(breast_cancer, features = "nFeature_Spatial", pt.size = 0.1) + 
  ggtitle("Genes") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot1 + plot2

Now let’s take a look at at a gene of interest with violin plots but also in image space.

p1 <- VlnPlot(breast_cancer, features = "IGFBP5", pt.size = 0.1) + 
  ggtitle("IGFBP5") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend() +
  stat_summary(fun=mean, geom="point", shape=23, size=4, color="red")

p2 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5")+ 
  theme(legend.position = "right")
CombinePlots is being deprecated. Plots should now be combined using the patchwork system.
p3 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")+ 
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green")) +
  NoLegend()
CombinePlots is being deprecated. Plots should now be combined using the patchwork system.
row1 <- p2 + p3 + plot_layout(nrow = 1)
row1 + p1+ plot_layout(nrow = 2, widths = c(0.5, 0.5))

We can also look at these data interactively

LinkedDimPlot(breast_cancer)

Spatially variable features

First we’ll identify deferentially expressed genes.

Parallelization helps here too let’s make sure our plan is still intact

plan()
Error in plan() : could not find function "plan"

- call: plan("multiprocess", workers = 4) indicates that it is

Looks like we have some very DE genes for clusters 4 and 11

clarify what ident.1 = 4, ident.2 = 6 are for

de_markers <- FindMarkers(breast_cancer, ident.1 = 4, ident.2 = 6)

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  |++++++++++++++++++++++++++++++++++++++++++++++++++| 99% ~00s          
  |++++++++++++++++++++++++++++++++++++++++++++++++++| 100% elapsed=31s  
de_markers

Identify the most up-regulated and down-regulated genes

de_markers_up <- de_markers %>%
  tibble::rownames_to_column(var = "Gene") %>% 
  arrange(-avg_logFC)

de_markers_down <- de_markers %>%
  tibble::rownames_to_column(var = "Gene") %>% 
  arrange(avg_logFC)

Most up-regulated genes

SpatialFeaturePlot(object = breast_cancer, features = de_markers_up$Gene[1:10], alpha = c(0.1, 1), ncol = 3)

Most down-regulated genes

SpatialFeaturePlot(object = breast_cancer, features = de_markers_down$Gene[1:10], alpha = c(0.1, 1), ncol = 3)

what are the top variable features?

VariableFeatures(breast_cancer)[1:10]
 [1] "IGKC"   "IGHG3"  "IGLC2"  "MGP"    "ALB"    "IGHG1"  "CPB1"   "CRISP3" "IGLC3" 
[10] "IGHM"  

what are the top DE genes?

rownames(de_markers)[1:10]
 [1] "CRISP3"  "IGFBP5"  "SLITRK6" "H3F3A"   "IGFBP4"  "MALAT1"  "C3"      "KRT18"  
 [9] "S100A11" "MGP"    

Spatially Variable Genes

So what about spatial enrichment?

Some methods

  1. Trendsceek
  2. Splotch
  3. SPARK
  4. SpatialDE
  • We have found this implementation not to be very effective. It’s also not under active development

Using the top 100 variable genes find spatially enriched ones. Note that in the Seurat Spatial Tutorial they use 1000 genes. You can also use all genes but that will take a long time. Using a calculation of Morans I can sometimes be a faster approach, especially if you are using parallization.

breast_cancer <- FindSpatiallyVariableFeatures(breast_cancer, 
                                               assay = "SCT", 
                                               slot = "scale.data", 
                                               features = VariableFeatures(breast_cancer)[1:100],
                                               selection.method = "markvariogram", verbose = TRUE)

Have a look at the spatially variable genes calculated by markvariogram ordered from most variable to least variable

SpatiallyVariableFeatures(breast_cancer, selection.method = "markvariogram", decreasing = TRUE)
  [1] "CRISP3"     "CXCL14"     "MGP"        "CPB1"       "COX6C"      "SLITRK6"   
  [7] "TTLL12"     "CCND1"      "MALAT1"     "AGR2"       "ALB"        "GFRA1"     
 [13] "S100G"      "CSTA"       "DEGS1"      "TFF3"       "MT-ND1"     "IGLC2"     
 [19] "MT-CO1"     "IGHG3"      "CD74"       "C6orf141"   "S100A6"     "MT-ND2"    
 [25] "TFF1"       "IGKC"       "IGHG1"      "APOE"       "ZNF350-AS1" "HLA-DRA"   
 [31] "AC087379.2" "IGHG4"      "C3"         "FCGR3B"     "TIMP1"      "LINC00645" 
 [37] "IGHM"       "SCGB2A2"    "KRT14"      "IGLC3"      "KRT17"      "LYZ"       
 [43] "APOC1"      "SCGB1D2"    "IGHA1"      "C1QA"       "AEBP1"      "APOD"      
 [49] "KRT5"       "MMP7"       "CCL19"      "COL6A2"     "TAGLN"      "S100A9"    
 [55] "IGHG2"      "COL1A2"     "DCN"        "SPP1"       "COL1A1"     "CGA"       
 [61] "VIM"        "IGFBP7"     "FN1"        "CCDC80"     "CXCL9"      "IGHA2"     
 [67] "TRBC2"      "SFRP2"      "KRT6B"      "S100A2"     "LUM"        "COL3A1"    
 [73] "IGLC7"      "SAA1"       "CARTPT"     "COMP"       "JCHAIN"     "CST1"      
 [79] "PTGDS"      "SFRP4"      "CD79A"      "CCL21"      "FABP4"      "MUC19"     
 [85] "ACKR1"      "POSTN"      "MMP9"       "S100A7"     "VWF"        "AQP1"      
 [91] "CLDN5"      "ACTA2"      "MS4A1"      "IGLL5"      "MYH11"      "CXCL10"    
 [97] "IGHD"       "HBB"        "TPSB2"      "AC005224.3"
top.features_trendseq <- head(SpatiallyVariableFeatures(breast_cancer, selection.method = "markvariogram"), 8)
SpatialFeaturePlot(breast_cancer, features = top.features_trendseq, ncol = 4, alpha = c(0.1, 1))

Moran’s I implementation. For other spatial data types the x.cuts and y.cuts determines the grid that is laid over the tissue in the capture area. Here we’ll remove those

breast_cancer <- FindSpatiallyVariableFeatures(breast_cancer, 
                                               assay = "SCT", 
                                               slot = "scale.data", 
                                               features = VariableFeatures(breast_cancer)[1:100],
                                               selection.method = "moransi")
Computing Moran's I

Have a look at the spatially variable genes calculated by moransi ordered from most variable to least variable

SpatiallyVariableFeatures(breast_cancer, selection.method = "moransi", decreasing = TRUE)
  [1] "CRISP3"     "CXCL14"     "TTLL12"     "SLITRK6"    "GFRA1"      "CCND1"     
  [7] "AGR2"       "COX6C"      "MGP"        "ALB"        "MALAT1"     "CPB1"      
 [13] "DEGS1"      "C6orf141"   "CSTA"       "MT-ND1"     "TFF3"       "MT-CO1"    
 [19] "S100A6"     "MT-ND2"     "LINC00645"  "FCGR3B"     "S100G"      "TFF1"      
 [25] "C3"         "ZNF350-AS1" "HLA-DRA"    "CD74"       "SCGB1D2"    "APOD"      
 [31] "IGLC2"      "TIMP1"      "IGHG3"      "SCGB2A2"    "APOC1"      "KRT14"     
 [37] "LYZ"        "CCDC80"     "APOE"       "TAGLN"      "IGHG1"      "AC087379.2"
 [43] "CCL19"      "SPP1"       "IGKC"       "S100A9"     "KRT17"      "IGHM"      
 [49] "FN1"        "KRT5"       "IGFBP7"     "C1QA"       "COL6A2"     "AQP1"      
 [55] "CXCL9"      "ACKR1"      "CARTPT"     "DCN"        "AEBP1"      "IGLC3"     
 [61] "IGHG4"      "VIM"        "S100A2"     "IGHG2"      "MMP7"       "IGHA1"     
 [67] "CCL21"      "KRT6B"      "TRBC2"      "COL1A2"     "CGA"        "SFRP2"     
 [73] "VWF"        "COL1A1"     "SAA1"       "MUC19"      "COL3A1"     "CLDN5"     
 [79] "SFRP4"      "POSTN"      "PTGDS"      "IGHA2"      "JCHAIN"     "CD79A"     
 [85] "ACTA2"      "LUM"        "CST1"       "S100A7"     "COMP"       "MS4A1"     
 [91] "IGLC7"      "MMP9"       "HBB"        "FABP4"      "MYH11"      "IGLL5"     
 [97] "CXCL10"     "TPSB2"      "IGHD"       "AC005224.3"
top.features_moransi <- head(SpatiallyVariableFeatures(breast_cancer, selection.method = "moransi"), 8)
SpatialFeaturePlot(breast_cancer, features = top.features_moransi, ncol = 4, alpha = c(0.1, 1))

We can see that the results are slightly different. So let’s take a look at why.

spatially_variable_genes <- breast_cancer@assays$SCT@meta.features %>%
  tidyr::drop_na()

spatially_variable_genes

You can see the two methods show

mm_cor <- cor.test(spatially_variable_genes$moransi.spatially.variable.rank, spatially_variable_genes$markvariogram.spatially.variable.rank)
ggplot(spatially_variable_genes, aes(x=moransi.spatially.variable.rank,y=markvariogram.spatially.variable.rank))+
  geom_point()+
  geom_smooth()+
  xlab("Morans I Rank")+
  ylab("Markvariogram Rank")+
  annotate("text", x = 25, y = 75, label = paste("Pearson's Correlation\n", round(mm_cor$estimate[1], digits = 2), sep = ""))+
  theme_bw()

Cancer annotations

Where are these genes being expressed relative to pathologist annotation?

ca <- readbitmap::read.bitmap("images/Breast Cancer Path.png")
# in the tutorial
# ca <- readbitmap::read.bitmap('/mnt/libs/shared_data/human_breast_cancer_1/images/Breast_Cancer_Path.png')
plot(0:1,0:1,type="n",ann=FALSE,axes=FALSE)
rasterImage(ca,0,0,1,1)

Looks like the Matrix Gla protein ( MGP ) gene is enriched in Ductal Carcinoma In Situ. Not a lot is known about MGP in the context of cancer but it looks like it could be an interesting novel gene to investigate with regard to Ductal Carcinoma In Situ.

SpatialFeaturePlot(object = breast_cancer, features = "MGP", alpha = c(0.1, 1), ncol = 3)

Multiple Sections

for workshop

breast_cancer_2 <- Load10X_Spatial(data.dir = "/mnt/libs/shared_data/human_breast_cancer_2/outs/",
                filename = "V1_Breast_Cancer_Block_A_Section_2_filtered_feature_bc_matrix.h5")

for 10x

breast_cancer_2 <- Load10X_Spatial(data.dir = "/mnt/analysis/marsoc/pipestances/HWHTFDSXX/SPATIAL_RNA_COUNTER_PD/163087/HEAD/outs/", 
                                   slice = "slice2")
breast_cancer_merged <- merge(breast_cancer, breast_cancer_2)
Some cell names are duplicated across objects provided. Renaming to enforce unique cell names.

Counts = UMI Features = Genes

plot1 <- SpatialFeaturePlot(breast_cancer_merged, features = "nCount_Spatial") + 
  theme(legend.position = "right")

plot2 <- SpatialFeaturePlot(breast_cancer_merged, features = "nFeature_Spatial") +
  theme(legend.position = "right")

plot1 + plot2 + plot_layout(nrow = 2)

Normalize merged data

This will take ~3min

Default assay will now be set to SCT

breast_cancer_merged <- SCTransform(breast_cancer_merged, assay = "Spatial", verbose = TRUE)
Calculating cell attributes for input UMI matrix
Variance stabilizing transformation of count matrix of size 20963 by 7834
Model formula is y ~ log_umi
Get Negative Binomial regression parameters per gene
Using 2000 genes, 7834 cells

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Found 4 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 20963 genes

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Computing corrected count matrix for 20963 genes

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Calculating gene attributes
Wall clock passed: Time difference of 6.223681 mins
Determine variable features
Set 3000 variable features
Place corrected count matrix in counts slot
Centering data matrix

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Set default assay to SCT
SpatialFeaturePlot(breast_cancer_merged, features = c("ERBB2", "CD8A"))

Single cell/nuclei ingegration

Here we have a preprocessed Seurat object with 10k nuclei annotated from a breast cancer sample. Don’t bother too much with the details of how this data was generated they don’t particularly matter for our purposes.

Load the Seurat object

10x infrastructure

load("/mnt/home/stephen.williams/yard/Odin/SIB_2020_Workshop/bc_snRNA.rds")
file ‘bc_snRNA.rds’ has magic number 'X'
  Use of save versions prior to 2 is deprecatedError in load("/mnt/home/stephen.williams/yard/Odin/SIB_2020_Workshop/bc_snRNA.rds") : 
  bad restore file magic number (file may be corrupted) -- no data loaded

For the workshop

bc_snRNA <- readRDS("/mnt/libs/shared_data/bc_snRNA.rds")
bc_snRNA
An object of class Seurat 
61450 features across 10000 samples within 2 assays 
Active assay: SCT (27912 features)
 1 other assay present: RNA
 3 dimensional reductions calculated: pca, harmony, umap

---
title: "SIB Days 2020 - Virtual Conference - June 8, 2020"
subtitle: "Dataset: Breast Cancer"
author:
  - Patrick Roelli, Computational Biologist 2 - Computational Biology^[10x Genomics, patrick.roelli@10xgenomics.com ]
  - Stefania Giacomello, Computational Biologist 2 - Computational Biology^[10x Genomics, stefania.giacomello@10xgenomics.com]
  - Stephen Williams, Senior Scientist - Computational Biology^[10x Genomics, stephen.williams@10xgenomics.com]
date: 'Last Compiled: `r format(Sys.Date(), "%B %d, %Y")`'
output:
  html_notebook:
    code_folding: none
    theme: journal
    toc: yes
    toc_depth: 3
    toc_float: yes
---

[![10x Home](https://github.com/stephenwilliams22/SIB_2020_Workshop/raw/master/images/10x%20homepage.png)](https://www.10xgenomics.com/)

# **Introduction**

Welcome to the **SIB Days 2020 - virtual conference** Spatial Transcriptomics workshop by 10x genomics!

The purpose of this tutorial will be to walk users through some of the steps necessary to explore data produced by the 10x Genomics Visium Spatial Gene Expression Solution and the [Spaceranger pipeline](https://support.10xgenomics.com/spatial-gene-expression/software/pipelines/latest/what-is-space-ranger). We will investigate the data sets  are all freely available from [10x Genomics](https://support.10xgenomics.com/spatial-gene-expression/datasets).

[Seurat Tutorial](https://satijalab.org/seurat/v3.1/spatial_vignette.html)

**Things to know about this workshop**

1. All files that will be used can be found at: `/mnt/libs/shared_data/`

[![Terminal](https://github.com/stephenwilliams22/SIB_2020_Workshop/raw/master/images/Terminal.png)]

2. Getting started with R and Visium data outside of Seurat at: https://support.10xgenomics.com/spatial-gene-expression/software/pipelines/latest/rkit
3. Reference genome for all samples is GRCh38/mm10
4. All 10x software including [Spaceranger](https://support.10xgenomics.com/spatial-gene-expression/software/pipelines/latest/what-is-space-ranger), and [Loupe Browser](https://support.10xgenomics.com/spatial-gene-expression/software/visualization/latest/what-is-loupe-browser), can be downloaded from the [10x Support Site](https://support.10xgenomics.com/)
5. Most Seurat figures can be controlled with patchwork because they are fundamentally ggplot objects. Some really nice examples can be found on the [Patchwork GitHub](https://patchwork.data-imaginist.com/articles/guides/layout.html)


# **Exploring Visium Data with Seurat**

## Load our packages
```{r Libraries, echo=TRUE, message=FALSE, warning=FALSE}
library(Seurat)
library(ggplot2)
library(patchwork)
library(dplyr)
library(RColorBrewer)
```

## Loading data in a Seurat object

Real Dataset for the tutorial
```{r eval=FALSE}
breast_cancer <- Load10X_Spatial(data.dir = "/mnt/libs/shared_data/human_breast_cancer_1/outs/",
                filename = "V1_Breast_Cancer_Block_A_Section_1_filtered_feature_bc_matrix.h5")
```


Same data just internal to 10x
```{r}
breast_cancer <- Load10X_Spatial(data.dir = "/mnt/analysis/marsoc/pipestances/HWHTFDSXX/SPATIAL_RNA_COUNTER_PD/163086/HEAD/outs/", slice = "slice1")
```

There are a bunch of data sets hosted by the Satija lab in the [Seurat Data Package](https://github.com/satijalab/seurat-data).

# **Results**
## QC
Let's have a look at some basic QC information. Keep in mind that most Seurat plots are ggplot object and can be manipulated as such.

Counts = UMI
Features = Genes
```{r, fig.width=10,fig.height=8, warning=FALSE}
plot1 <- VlnPlot(breast_cancer, features = "nCount_Spatial", pt.size = 0.1) + 
  ggtitle("UMI") +
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot2 <- VlnPlot(breast_cancer, features = "nFeature_Spatial", pt.size = 0.1) + 
  ggtitle("Genes") +
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot3 <- SpatialFeaturePlot(breast_cancer, features = "nCount_Spatial") + 
  theme(legend.position = "right")

plot4 <- SpatialFeaturePlot(breast_cancer, features = "nFeature_Spatial") +
  theme(legend.position = "right")

plot1 + plot2 + plot3  + plot4 + plot_layout(nrow = 2, ncol = 2)
```

## Normalization

Spaceranger does normalization for clustering and DE but does not return that normalized matrix

Pre-normalization 
Raw UMI counts
```{r, fig.width=10, warning=FALSE}
SpatialFeaturePlot(breast_cancer, features = c("ERBB2", "CD8A"))
```

### SE transform

+  This will take ~3-4 min. 

Don't worry about `reachediteration limit` warnings. See https://github.com/ChristophH/sctransform/issues/25 for discussion

Default assay will now be set to SCT
```{r, warning=FALSE}
breast_cancer <- SCTransform(breast_cancer, assay = "Spatial", verbose = TRUE)
```

```{r, fig.width=10, warning=FALSE}
SpatialFeaturePlot(breast_cancer, features = c("ERBB2", "CD8A"))
```


From Seurat: 

The default parameters in Seurat emphasize the visualization of molecular data. However, you can also adjust the size of the spots (and their transparency) to improve the visualization of the histology image, by changing the following parameters:

    pt.size.factor- This will scale the size of the spots. Default is 1.6
    alpha - minimum and maximum transparency. Default is c(1, 1).
    Try setting to alpha c(0.1, 1), to downweight the transparency of points with lower expression



```{r, fig.width=10, warning=FALSE}
p1 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5", pt.size.factor = 1)+ 
  theme(legend.position = "right") +
  ggtitle("Actual Spot Size")
p2 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5")+ 
  theme(legend.position = "right") +
  ggtitle("Scaled Spot Size")
p1 + p2
```

### Dimensionality reduction, clustering, and visualization

We can then proceed to run dimensionality reduction and clustering on the RNA expression data, using the same workflow as we use for scRNA-seq analysis.

Some of these processes can be parallized

```{r eval=FALSE, include=TRUE}
library(future)
# check the current active plan
plan()
```

```{r eval=FALSE, include=TRUE}
# change the current plan to access parallelization
plan("multiprocess", workers = 4)
plan()
```


The default UMAP calculation is performed with the [R-based UWOT](https://cran.r-project.org/web/packages/uwot/index.html) library However, you can run UMAP in python via reticulate library and `umap-learn`. We have found that for smaller data sets (<= 10k cells/spots) UWOT is great. For much larger data sets (100k + cells/spots) `umap-learn` can be a faster option.

```{r}
breast_cancer <- RunPCA(breast_cancer, assay = "SCT", verbose = FALSE)
breast_cancer <- FindNeighbors(breast_cancer, reduction = "pca", dims = 1:30)
breast_cancer <- FindClusters(breast_cancer, verbose = FALSE)
breast_cancer <- RunUMAP(breast_cancer, reduction = "pca", dims = 1:30)
```

Now let's have a look at the clustering

```{r, fig.width=8}
DimPlot(breast_cancer, reduction = "umap", label = FALSE,) +
  labs(color = "Cluster")
```

```{r, fig.width=10,fig.height=10, warning=FALSE}
p1 <- DimPlot(breast_cancer, reduction = "umap", label = TRUE) +
  labs(color = "Cluster")
p2 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")

p1 + p2 + plot_annotation(
  title = 'Clustering in UMAP and Tissue Space',
  caption = 'Processed by Spaceranger 1.1\nNormilization and Clustering by Seurat'
) + plot_layout(nrow = 1)
```

I don't really like these colors so let's change them
```{r}
myPalette <- colorRampPalette(rev(brewer.pal(11, "Spectral")))
```

```{r, fig.width=10, fig.height=10, warning=FALSE}
p1 <- DimPlot(breast_cancer, reduction = "umap", label = TRUE) +
  labs(color = "Cluster") + 
  scale_color_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))

p2 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")+ 
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))

p1 + p2 + plot_annotation(
  title = 'Clustering in UMAP and Tissue Space',
  caption = 'Processed by Spaceranger 1.1\nNormilization and Clustering by Seurat'
) + plot_layout(nrow = 1)
```

If interested you can also now look at UMI and Gene counts per cluster as well
```{r}
plot1 <- VlnPlot(breast_cancer, features = "nCount_Spatial", pt.size = 0.1) + 
  ggtitle("UMI") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.text.x = element_blank(), 
        axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot2 <- VlnPlot(breast_cancer, features = "nFeature_Spatial", pt.size = 0.1) + 
  ggtitle("Genes") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend()

plot1 + plot2
```


Now let's take a look at at a gene of interest with violin plots but also in image space.
```{r, fig.width=8, fig.height=8}
p1 <- VlnPlot(breast_cancer, features = "IGFBP5", pt.size = 0.1) + 
  ggtitle("IGFBP5") +
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green"))+
  theme(axis.title.x = element_blank(), 
        legend.position = "right") +
  NoLegend() +
  stat_summary(fun=mean, geom="point", shape=23, size=4, color="red")

p2 <- SpatialFeaturePlot(breast_cancer, features = "IGFBP5")+ 
  theme(legend.position = "right")

p3 <- SpatialDimPlot(breast_cancer, label = TRUE, label.size = 3) +
  labs(fill = "Cluster")+ 
  scale_fill_manual(values = c("#b2df8a","#e41a1c","#377eb8","#4daf4a","#ff7f00","gold", 
                               "#a65628", "#999999", "black", "pink", "purple", "brown",
                               "grey", "yellow", "green")) +
  NoLegend()

row1 <- p2 + p3 + plot_layout(nrow = 1)
row1 + p1+ plot_layout(nrow = 2, widths = c(0.5, 0.5))
```

We can also look at these data interactively
```{r eval=FALSE, include=TRUE}
LinkedDimPlot(breast_cancer)
```

## Spatially variable features

First we'll identify deferentially expressed genes. 

Parallelization helps here too let's make sure our plan is still intact

```{r, eval=FALE, include=TRUE}
plan()
```
`- call: plan("multiprocess", workers = 4)` indicates that it is

Looks like we have some very DE genes for clusters 4 and 11


clarify what ident.1 = 4, ident.2 = 6 are for
```{r, fig.width=10, warning=FALSE, message=FALSE}
de_markers <- FindMarkers(breast_cancer, ident.1 = 4, ident.2 = 6)
de_markers
```

## Identify the most up-regulated and down-regulated genes
```{r}
de_markers_up <- de_markers %>%
  tibble::rownames_to_column(var = "Gene") %>% 
  arrange(-avg_logFC)

de_markers_down <- de_markers %>%
  tibble::rownames_to_column(var = "Gene") %>% 
  arrange(avg_logFC)
```


### Most up-regulated genes
```{r, fig.width=10, fig.height=10, warning=FALSE}
SpatialFeaturePlot(object = breast_cancer, features = de_markers_up$Gene[1:10], alpha = c(0.1, 1), ncol = 3)
```

### Most down-regulated genes
```{r, fig.width=10, fig.height=10, warning=FALSE}
SpatialFeaturePlot(object = breast_cancer, features = de_markers_down$Gene[1:10], alpha = c(0.1, 1), ncol = 3)
```

what are the top variable features?
```{r}
VariableFeatures(breast_cancer)[1:10]
```

what are the top DE genes?
```{r}
rownames(de_markers)[1:10]
```

## Spatially Variable Genes

So what about spatial enrichment? 

Some methods

1. [Trendsceek](https://www.nature.com/articles/nmeth.4634)
2. [Splotch](https://www.biorxiv.org/content/10.1101/757096v1)
3. [SPARK](https://www.nature.com/articles/s41592-019-0701-7)
4. [SpatialDE](https://www.nature.com/articles/nmeth.4636)
  + We have found this implementation not to be very effective. It's also not under active development


Using the top 100 variable genes find spatially enriched ones. Note that in the Seurat Spatial Tutorial they use 1000 genes. You can also use all genes but that will take a long time. Using a calculation of [Morans I](https://en.wikipedia.org/wiki/Moran%27s_I) can sometimes be a faster approach, especially if you are using parallization.


```{r}
breast_cancer <- FindSpatiallyVariableFeatures(breast_cancer, 
                                               assay = "SCT", 
                                               slot = "scale.data", 
                                               features = VariableFeatures(breast_cancer)[1:100],
                                               selection.method = "markvariogram", verbose = TRUE)
```

Have a look at the spatially variable genes calculated by `markvariogram` ordered from most variable to least variable
```{r}
SpatiallyVariableFeatures(breast_cancer, selection.method = "markvariogram", decreasing = TRUE)
```

```{r, fig.width=10, fig.height=8, warning=FALSE}
top.features_trendseq <- head(SpatiallyVariableFeatures(breast_cancer, selection.method = "markvariogram"), 8)
SpatialFeaturePlot(breast_cancer, features = top.features_trendseq, ncol = 4, alpha = c(0.1, 1))
```

Moran's I implementation. For other spatial data types the x.cuts and y.cuts determines the grid that is laid over the tissue in the capture area. Here we'll remove those
```{r}
breast_cancer <- FindSpatiallyVariableFeatures(breast_cancer, 
                                               assay = "SCT", 
                                               slot = "scale.data", 
                                               features = VariableFeatures(breast_cancer)[1:100],
                                               selection.method = "moransi")
```


Have a look at the spatially variable genes calculated by `moransi` ordered from most variable to least variable

```{r}
SpatiallyVariableFeatures(breast_cancer, selection.method = "moransi", decreasing = TRUE)
```

```{r, fig.width=10, fig.height=8, warning=FALSE}
top.features_moransi <- head(SpatiallyVariableFeatures(breast_cancer, selection.method = "moransi"), 8)
SpatialFeaturePlot(breast_cancer, features = top.features_moransi, ncol = 4, alpha = c(0.1, 1))
```

We can see that the results are slightly different. So let's take a look at why.

```{r}
spatially_variable_genes <- breast_cancer@assays$SCT@meta.features %>%
  tidyr::drop_na()

spatially_variable_genes
```
You can see the two methods show 
```{r}
mm_cor <- cor.test(spatially_variable_genes$moransi.spatially.variable.rank, spatially_variable_genes$markvariogram.spatially.variable.rank)
ggplot(spatially_variable_genes, aes(x=moransi.spatially.variable.rank,y=markvariogram.spatially.variable.rank))+
  geom_point()+
  geom_smooth()+
  xlab("Morans I Rank")+
  ylab("Markvariogram Rank")+
  annotate("text", x = 25, y = 75, label = paste("Pearson's Correlation\n", round(mm_cor$estimate[1], digits = 2), sep = ""))+
  theme_bw()
```

## Cancer annotations

Where are these genes being expressed relative to pathologist annotation?

```{r, fig.height=8, fig.width=8}
ca <- readbitmap::read.bitmap("images/Breast Cancer Path.png")
# in the tutorial
# ca <- readbitmap::read.bitmap('/mnt/libs/shared_data/human_breast_cancer_1/images/Breast_Cancer_Path.png')
plot(0:1,0:1,type="n",ann=FALSE,axes=FALSE)
rasterImage(ca,0,0,1,1)
```

Looks like the  Matrix Gla protein ( _MGP_ ) gene is enriched in Ductal Carcinoma _In Situ_. Not a lot is known about _MGP_ in the context of cancer but it looks like it could be an interesting novel gene to investigate with regard to Ductal Carcinoma _In Situ_.

```{r, warning=FALSE}
SpatialFeaturePlot(object = breast_cancer, features = "MGP", alpha = c(0.1, 1), ncol = 3)
```

# Multiple Sections

for workshop
```{r eval=FALSE}
breast_cancer_2 <- Load10X_Spatial(data.dir = "/mnt/libs/shared_data/human_breast_cancer_2/outs/",
                filename = "V1_Breast_Cancer_Block_A_Section_2_filtered_feature_bc_matrix.h5")
```
for 10x
```{r}
breast_cancer_2 <- Load10X_Spatial(data.dir = "/mnt/analysis/marsoc/pipestances/HWHTFDSXX/SPATIAL_RNA_COUNTER_PD/163087/HEAD/outs/", 
                                   slice = "slice2")
```

```{r}
breast_cancer_merged <- merge(breast_cancer, breast_cancer_2)
```

Counts = UMI
Features = Genes
```{r, fig.width=10,fig.height=10, warning=FALSE}
plot1 <- SpatialFeaturePlot(breast_cancer_merged, features = "nCount_Spatial") + 
  theme(legend.position = "right")

plot2 <- SpatialFeaturePlot(breast_cancer_merged, features = "nFeature_Spatial") +
  theme(legend.position = "right")

plot1 + plot2 + plot_layout(nrow = 2)
```

## Normalize merged data

This will take ~3min

Default assay will now be set to SCT
```{r, warning=FALSE}
breast_cancer_merged <- SCTransform(breast_cancer_merged, assay = "Spatial", verbose = TRUE)
```

```{r, fig.width=10, warning=FALSE}
SpatialFeaturePlot(breast_cancer_merged, features = c("ERBB2", "CD8A"))
```

# Single cell/nuclei ingegration

Here we have a preprocessed Seurat object with 10k nuclei annotated from a breast cancer sample. Don't bother too much with the details of how this data was generated they don't particularly matter for our purposes. 

## Load the Seurat object
10x infrastructure
```{r}
bc_snRNA <- readRDS("/mnt/home/stephen.williams/yard/Odin/SIB_2020_Workshop/bc_snRNA.rds")
```

For the workshop
```{r eval=FALSE, include=TRUE}
bc_snRNA <- readRDS("/mnt/libs/shared_data/bc_snRNA.rds")
```


```{r}
bc_snRNA
```

```{r, fig.width=10}
DimPlot(bc_snRNA, group.by = "subclass", label = FALSE)
```
